Only set PYTHON_EGG_CACHE if it isn't already set

Change-Id: I6503c80a236a1720562377d04313ee2688336c85
Made the HTTP comparisons slightly more idiomatic

This way they are more obviously range tests

Change-Id: Ia782a8f5ddb5958f9da828e2caadf0a8e3c3ff11
Merge "Only set PYTHON_EGG_CACHE if it isn't already set"
Merge "Made the HTTP comparisons slightly more idiomatic"